If you have FTP access (or File Manager on your hosting place), just rename the plugin’s folder (in wp-content\plugins). That will deactivate the plugin, but won’t remove the settings.
Once you fix things, you can put the plugin’s folder name back to the original name. Then reactivate it.
(This is a great way to find an ‘offending’ plugin: just rename a plugins’ folder name until the site is back to normal. )